This book authored by Mykola Beshley, Mykhailo Klymash, Halyna Beshley, Natalia Kryvinska and Orest Kochan explores challenges faced by smart systems, emphasizing the need for effective communication and real-time decision-making. IoT, cloud/edge computing, SDN, and AI converge to offer transformative solutions. Highlighting the urgency of addressing these issues, the monograph underscores the growing reliance on smart systems across industries. IoT generates vast data, managed efficiently by cloud/edge computing, while SDN provides dynamic networking control, and AI enables intelligent decision-making. Their synergy forms a holistic framework to revolutionize smart systems practically, reshaping interactions in our interconnected digital world. The monograph discusses the basics of IoT, communication technologies, modeling scenarios and challenges in smart systems. The concept of integrating IoT, 5G, edge/cloud computing, blockchain, and artificial intelligence for future smart grids is proposed.